International mostly means something (a company, language, or organization) involving more than a single country. The term international as a word means involvement of, interaction between or encompassing more than one nation, or generally beyond national boundaries. For example, international law, which is applied by more than one country and usually everywhere on Earth, and international language which is a language spoken by residents of more than one country.
From Middle French national; see nation.
national (comparative more national, superlative most national)
See nation for notes regarding the usage of national to refer to the UK and its member states.
national (plural nationals)
inter- + national. Reportedly coined in modern English by Jeremy Bentham.
international (comparative more international, superlative most international)
international (plural internationals)